Nut-lock.



C. C. BLOSSOM.

NUT Loox. APPLICATION FILED APILM, 1909.

Patented Mar. 1, 1910.

CHARLES C. BLOSSOM, `F WICKFOBD, BHODE'ISLAND.

NUT-LOCK.

Speoication of Letters Patent.

Patented Mar. 1,1e1o.

Application ined ru 24, 1909. seal no. 492,02'1-REISSUE D To all lwhom'it may mcem:

Be it known that I, CHARLES C. Blossom, a citizen of the United States,and a resident of Wickford, county of IVashington, State of RhodeIsland, have invented a new anduseful'Improvement in Nut-Locks of whichthe following .is a specification, reference being had to theaccompanying drawing, in which- Figure 1 illustrates an elevation,partly in section, of the invention, all the parts being assembled andin operative posit1on; Fig. 2

illustrates an edgewise view of the preferred form of washer, the springpawl being permanentl connected with 1t by riveting; Fig.2a i lustratesa face view of the washer shown in Fig. 2, the spring awl being shown indotted lines; Fig. 3 ilustrates a Vmodiedform of washer; Fig. 3aillustrates a face view of the washer shown in Fig; 3. Fig.fiillustrates an interior view of the preferred form of nut used withthe inventlon Fig. 5 illustrates the bolt which is usedwhen the washershown in Figs. 3 and 3 is used.

Many forms of nut lock resembling generally that shown herein have beenheretofore invented and patented, but they have all, so far as I amaware, been open to one or the other of a series of'objections which itis the object of this present invention to obviate.

Among the objections referred to are vthe following: The spring pawlrelied on to effect the locking of the nut has always been a loose,separate part, very apt to become'misplaced or lost during theinstallation of the work in the rst instance, or during repair, thusrendering the entirev device useless. Again the groove cut in the .shankof the bolt when that form of lock has been employed to prevent thewasherfrom turning has been cut so deep that moisture coul penetratethrough the groove, past the threads of the bolt and nut, into the verycenter of the structure, thus rusting out the spring pawl vand otherfparts and soon destroying the efficiency o the whole. Again the notchesin which the point of the pawl engage and which are relied upon toeffect the locking ofthe nut have generallyV been v either upon the nutor upon the washer.

Consequently, as soon as they become worn in use, or because of rustingaway, the usefulness of the entire structure` is also one. By thispresent invention I obviate a the foregoing objections.

' Referring now to the drawings, 1, 1, represent the parts, whateverthey may be,

which are to be bolted together, 2 the bolt which ma be headed atoneend, as at 3, and threa ed at the other end, 4.

5 is a washer which has a hole 8 through its center which preferablyfits the bolt somewhat accurately. The preferred form of washer is shownin Figs. 2 and 2. In it a stud 6 projects from one of its sides,preferably adjacent to the bolt hole and on the other side there areproduced a radiating.

series of notches Y7, which preferably surround the central open-ing or4bolt hole 8. At some suitable place in this washer there is also made ahole 9 in which the end 10 of. the spring pawl 11 is placed and rivetedor otherwise permanently fastened, so that the pawl cannot becomedetached from the washer.

The nut 12, .which I prefer to usie, isl

shown in section in Fig. l, and in planen. where .a View of its hollowinterior. Its exterior is preferably -rnade4 Fig. 4 is shown.

angular in form, that it may be convene .iently turned by an. ordinarywrench. It is also preferably provided with a projecting annular flange13, which will inclose the spring lpawl, thus protecting it from injuryand wi operation of screwing up or unscrewing `the nut; the flange willalso act as a stop to the nut preventing it from being screwed up so farias to injure the sprin pawl, or the notches, because the outer et ge ofthe flange, after the nut has been properly screwed up,. will come incontact with the' surface of the washer which is adjacent to thusarresting further movement of the nut. In the bottom vof the cup-shapedrecess in the nut formed by the surrounding flan e, a series of notches14, resembling the notc es 7 on the washer are made 'and there is alsoprovided a hole 15, resembling the hole 9 in the washer. It is adaptedto receive the end 10 of the spring pawl. This hole may be boredentirely through the nut which will facilitate the riveting of the en ofthe spring pawl therein, or only part way through, if preferred, for thesake of excluding moisture, etc., from the structure. If the latterconstructlon is employed, then I prefer to expand the hole somewhat nearits bottom so that the end of the spring pawl firmly held.

also act as a guide for it during the /I/ The bolt which I refer toemploy with- `the parts thus far escribed is shown in Fig. 5, exceptthat it will not have the groove shown' in 1t (hereinafter to bedescribed) f whichis used only,y when thelwasher shown in Figs. 3 and'which has not yet been referred to, is used.

#The opefrationtof. structure thus far escribed'fis "sV follows: Theparts are assembled as shown in Fig. 1. The washerV ispreventedfromrturning by the stud pwhich enters a suitablenotch orrecess which Ymay be conveniently made with the hammer and cold chisel,or with a ile,1in the edge of the bolt hole made through the appropriatepiece 1. The spring pawl beingpermanently attached to the washer, will,when the washer is itself in position be likewise properly 1ocatedsurrounding the bolt, to perform its function. Thereupon the nut is.threaded onto the bolt and screwed down tight, 1n so doing the free edof the spring pawl will engage in and slip from one to the other of thenotches 14 in the cup of the nut and when the nut is screwed completelyhome,

the end of the pawl will rest in or against the particular notch withwhich it last'd enaged and will prevent the nut from turnlng backwardlyunder the infiuence of such shocks or jars as it will -be subjected toin use, but the free end of the pawl and the notches are so rounded inshape that the .-nut may be turned backwardly when sufficient power isintentionally applied to it,

as by a wrench or equivalent tool, and thus the nut be loosened.

In certain uses lof lock nut bolts of the" class in question it isdesirable that the nut should be frequently loosened; in such cases thenotches are `after a time apt to be worn vaway or so rounded olf thatthe pawl will not any longer holdsulflciently against them. In ordertherefore to extend the life of the structure I provide Athenotches 7 inthe 45 washer (see Fig. 2a) and a hole 15 in the 'nut (see Fig. 4), sothat should the notches vin the nut become defective, as suggested, theend of the pawl may be d1sengaged from the hole in the washer andtransferred to and suitably fastened in the hole 15 of the nut,whereupon its free end will engage in the hitherto unused notches in thewasher in the same manner that it before engaged in thenotches in thenut, and thus the life of the structure will be doubled.

In Figs.'3, 3a and 5 I show a construction of the washer and boltsomewhat resembling forms now known, but with the following differences.Instead of the lug 6 shown in Fi s. 2 and 2 to vrevent the turninof of gv s the washer, I provi e a lug 16, which proects inwardlytoward thecenter of the bolt ole 8,. and if the washer is not thick enough tovgive the requisite strength orbearing to this lug, then it may beextended above and below the washer as seen at 17, and 1S, one or both.This lug fits-.in a groove 19 made Vin the side of the bolt, but insteadof being The operation of the form of the invention just described willbeI understood without specific explanation, from that which has alreadybeen said.

The specific details of construction described and illustrated may besomewhat departed from and yet the essentials of my invention beemployed. -I therefore do not limit myself to such details.

I claim:

1. The combination with a threaded bolt of a vthreaded nut provided withrounded notches and having a hole adapted to re- Y ceive the end of apawl, a washer provided with a lug and with rounded notches and havingalso a hole adapted to receive the end of said pawl, and a reversiblespring pawl one end of whichis adapted to be interchangeably fastened inthe hole in thc nut or the hole in the washer, as desired.

2. The combination with a threaded bolt of a threaded nut, a Vflange onthe nut,

rounded notches on the nut within the flange, a washer provided with alug, and

having Y rounded notches and a reversible spring pawl one end of whichis adapted to be interchangeably fastened in the hole in the nut or inthe hole in the washer, as desired.

3. The combination of av threaded vbolt having a groove which cross-cutsthe threads, but does not entirely remove them, a washer having a lugadapted to enter lthel groove in the bolt and having also roundednotches, a threaded nut having rounded,

notches, 'a pawl, interposed between the nut and the washer and meanswhereby the pawl may be interchangeably attached yto either the nut'orthe washer, so as to engage with the notches-upon the other of saidparts and prevent the nut from turning.

In witness whereof I have signed my name to this specification in thepresence of two subscribingfwitnesses. t

CHARLES C. BLOSSOM.

Witnesses HELEN H. GREENEL THOMAS J. Pnlnorzajf'

